Boneless lamb is easier to find than the bone-in variety, and it's much easier to work with. More exciting than mint, the peppery flavor of the
watercress pesto is intensified by a strong dash of Dijon mustard—a perfect companion for the lamb's rich flavor.
step 1Preheat oven to 400°F.
step 2Rinse the leg of lamb and pat dry. Open the leg and butterfly by making a deep incision almost through the leg, allowing you to lay the leg out flat. Cut away large pieces of fat or gristle.
step 3Rub the leg all over with the olive oil and seasonings (garlic, salt, pepper, and rosemary leaves). Place the seasoned leg in a roasting pan, cut side down. Place the pan in the middle of the preheated oven and cook to desired doneness. For medium rare lamb, the meat thermometer should register at 135°F (approximately 30 minutes).
step 4Let the meat rest for 20 minutes before slicing.
step 5Make the Watercress Pesto and serve warm or at cool temperature in a separate serving dish (as sauce for the lamb). Or cook up a bowl of pasta, toss it with this
Watercress Pesto and serve as a side dish with this lamb.